Igcse Model Questions Vol1 2021 Chemistry Question 26

Practice objective / multiple choice question 26 from the 2021 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Easy Difficulty
Question 26 IGCSE_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective
Igcse Model Questions Vol1 2021 Chemistry Question 26 diagram

The diagram shows a simplified Bohr model of an atom of element X. The innermost shell contains \(2\) electrons, the second shell contains \(8\) electrons, and the outermost shell contains \(5\) electrons. Using this information, determine the atomic number of element X and write its ground‑state electron configuration.

Answer Options

A. Atomic number = 17; electron configuration = \(1s^2 2s^2 2p^6 3s^2 3p^5\)
Correct Answer B. Atomic number = 15; electron configuration = \(1s^2 2s^2 2p^6 3s^2 3p^5\)
C. Atomic number = 14; electron configuration = \(1s^2 2s^2 2p^6 3s^2 3p^2\)
D. Atomic number = 16; electron configuration = \(1s^2 2s^2 2p^6 3s^2 3p^4\)
Correct Answer
B
Correct Option:
Atomic number = 15; electron configuration = \(1s^2 2s^2 2p^6 3s^2 3p^5\)

About This Question

This is Igcse Model Questions Vol1 2021 Chemistry Question 26. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Easy .

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